Skillbuildersä Bi Height Wedge 18 x 22 Height: 4 or 6 Manual Electric Treadmills Traction Device * Pulls at Mineral oil softens and Traction Device * Pulls at the base of the occiput for more effective cervical traction and adapts easily to most other traction devices and units * Performs horizontal traction * One size fits most patients * Clevis is included (specify traction brand when ordering) * Other traction brands are: Chattanooga and Triton * Power: 4 sections of NO Position at a higher or lower height (use on side 1 or side 2) * Without the removable straps the deluxe wedge functions just like the standard Skillbuilders© wedge *